pcie ntb doorbell

PCIe NTB (Non-Transparent Bridge) Doorbell is a mechanism used for inter-processor communication in multi-processor systems. It allows one processor to notify another processor of a specific event, such as the arrival of data or the completion of a task, without interrupting its current operation. The doorbell mechanism operates by writing a specific value to a doorbell register, which triggers an interrupt on the receiving processor. This enables efficient and low-latency communication between processors in a multi-processor system.